1 /* v3_conf.c */ 2 /* 3 * Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL project 4 * 1999. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing (at) OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). */ 57 58 /* extension creation utilities */ 59 60 #include <ctype.h> 61 #include <stdio.h> 62 #include <string.h> 63 64 #include <openssl/conf.h> 65 #include <openssl/err.h> 66 #include <openssl/mem.h> 67 #include <openssl/obj.h> 68 #include <openssl/x509.h> 69 #include <openssl/x509v3.h> 70 71 #include "../internal.h" 72 73 static int v3_check_critical(char **value); 74 static int v3_check_generic(char **value); 75 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 76 int crit, char *value); 77 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 78 int crit, int type, 79 X509V3_CTX *ctx); 80 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, 81 int ext_nid, int crit, void *ext_struc); 82 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, 83 long *ext_len); 84 /* CONF *conf: Config file */ 85 /* char *name: Name */ 86 /* char *value: Value */ 87 X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name, 88 char *value) 89 { 90 int crit; 91 int ext_type; 92 X509_EXTENSION *ret; 93 crit = v3_check_critical(&value); 94 if ((ext_type = v3_check_generic(&value))) 95 return v3_generic_extension(name, value, crit, ext_type, ctx); 96 ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value); 97 if (!ret) { 98 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_IN_EXTENSION); 99 ERR_add_error_data(4, "name=", name, ", value=", value); 100 } 101 return ret; 102 } 103 104 /* CONF *conf: Config file */ 105 /* char *value: Value */ 106 X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, 107 char *value) 108 { 109 int crit; 110 int ext_type; 111 crit = v3_check_critical(&value); 112 if ((ext_type = v3_check_generic(&value))) 113 return v3_generic_extension(OBJ_nid2sn(ext_nid), 114 value, crit, ext_type, ctx); 115 return do_ext_nconf(conf, ctx, ext_nid, crit, value); 116 } 117 118 /* CONF *conf: Config file */ 119 /* char *value: Value */ 120 static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, 121 int crit, char *value) 122 { 123 const X509V3_EXT_METHOD *method; 124 X509_EXTENSION *ext; 125 STACK_OF(CONF_VALUE) *nval; 126 void *ext_struc; 127 if (ext_nid == NID_undef) { 128 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME); 129 return NULL; 130 } 131 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 132 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 133 return NULL; 134 } 135 /* Now get internal extension representation based on type */ 136 if (method->v2i) { 137 if (*value == '@') 138 nval = NCONF_get_section(conf, value + 1); 139 else 140 nval = X509V3_parse_list(value); 141 if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) { 142 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_EXTENSION_STRING); 143 ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", 144 value); 145 if (*value != '@') 146 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 147 return NULL; 148 } 149 ext_struc = method->v2i(method, ctx, nval); 150 if (*value != '@') 151 sk_CONF_VALUE_pop_free(nval, X509V3_conf_free); 152 if (!ext_struc) 153 return NULL; 154 } else if (method->s2i) { 155 if (!(ext_struc = method->s2i(method, ctx, value))) 156 return NULL; 157 } else if (method->r2i) { 158 if (!ctx->db || !ctx->db_meth) { 159 OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE); 160 return NULL; 161 } 162 if (!(ext_struc = method->r2i(method, ctx, value))) 163 return NULL; 164 } else { 165 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED); 166 ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid)); 167 return NULL; 168 } 169 170 ext = do_ext_i2d(method, ext_nid, crit, ext_struc); 171 if (method->it) 172 ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it)); 173 else 174 method->ext_free(ext_struc); 175 return ext; 176 177 } 178 179 static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, 180 int ext_nid, int crit, void *ext_struc) 181 { 182 unsigned char *ext_der; 183 int ext_len; 184 ASN1_OCTET_STRING *ext_oct; 185 X509_EXTENSION *ext; 186 /* Convert internal representation to DER */ 187 if (method->it) { 188 ext_der = NULL; 189 ext_len = 190 ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it)); 191 if (ext_len < 0) 192 goto merr; 193 } else { 194 unsigned char *p; 195 ext_len = method->i2d(ext_struc, NULL); 196 if (!(ext_der = OPENSSL_malloc(ext_len))) 197 goto merr; 198 p = ext_der; 199 method->i2d(ext_struc, &p); 200 } 201 if (!(ext_oct = M_ASN1_OCTET_STRING_new())) 202 goto merr; 203 ext_oct->data = ext_der; 204 ext_oct->length = ext_len; 205 206 ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct); 207 if (!ext) 208 goto merr; 209 M_ASN1_OCTET_STRING_free(ext_oct); 210 211 return ext; 212 213 merr: 214 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE); 215 return NULL; 216 217 } 218 219 /* Given an internal structure, nid and critical flag create an extension */ 220 221 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) 222 { 223 const X509V3_EXT_METHOD *method; 224 if (!(method = X509V3_EXT_get_nid(ext_nid))) { 225 OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION); 226 return NULL; 227 } 228 return do_ext_i2d(method, ext_nid, crit, ext_struc); 229 } 230 231 /* Check the extension string for critical flag */ 232 static int v3_check_critical(char **value) 233 { 234 char *p = *value; 235 if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) 236 return 0; 237 p += 9; 238 while (isspace((unsigned char)*p)) 239 p++; 240 *value = p; 241 return 1; 242 } 243 244 /* Check extension string for generic extension and return the type */ 245 static int v3_check_generic(char **value) 246 { 247 int gen_type = 0; 248 char *p = *value; 249 if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) { 250 p += 4; 251 gen_type = 1; 252 } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) { 253 p += 5; 254 gen_type = 2; 255 } else 256 return 0; 257 258 while (isspace((unsigned char)*p)) 259 p++; 260 *value = p; 261 return gen_type; 262 } 263 264 /* Create a generic extension: for now just handle DER type */ 265 static X509_EXTENSION *v3_generic_extension(const char *ext, char *value, 266 int crit, int gen_type, 267 X509V3_CTX *ctx) 268 { 269 unsigned char *ext_der = NULL; 270 long ext_len = 0; 271 ASN1_OBJECT *obj = NULL; 272 ASN1_OCTET_STRING *oct = NULL; 273 X509_EXTENSION *extension = NULL; 274 if (!(obj = OBJ_txt2obj(ext, 0))) { 275 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NAME_ERROR); 276 ERR_add_error_data(2, "name=", ext); 277 goto err; 278 } 279 280 if (gen_type == 1) 281 ext_der = string_to_hex(value, &ext_len); 282 else if (gen_type == 2) 283 ext_der = generic_asn1(value, ctx, &ext_len); 284 285 if (ext_der == NULL) { 286 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_VALUE_ERROR); 287 ERR_add_error_data(2, "value=", value); 288 goto err; 289 } 290 291 if (!(oct = M_ASN1_OCTET_STRING_new())) { 292 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE); 293 goto err; 294 } 295 296 oct->data = ext_der; 297 oct->length = ext_len; 298 ext_der = NULL; 299 300 extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct); 301 302 err: 303 ASN1_OBJECT_free(obj); 304 M_ASN1_OCTET_STRING_free(oct); 305 if (ext_der) 306 OPENSSL_free(ext_der); 307 return extension; 308 309 } 310 311 static unsigned char *generic_asn1(char *value, X509V3_CTX *ctx, 312 long *ext_len) 313 { 314 ASN1_TYPE *typ; 315 unsigned char *ext_der = NULL; 316 typ = ASN1_generate_v3(value, ctx); 317 if (typ == NULL) 318 return NULL; 319 *ext_len = i2d_ASN1_TYPE(typ, &ext_der); 320 ASN1_TYPE_free(typ); 321 return ext_der; 322 } 323 324 /* 325 * This is the main function: add a bunch of extensions based on a config 326 * file section to an extension STACK. 327 */ 328 329 int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section, 330 STACK_OF(X509_EXTENSION) **sk) 331 { 332 X509_EXTENSION *ext; 333 STACK_OF(CONF_VALUE) *nval; 334 CONF_VALUE *val; 335 size_t i; 336 if (!(nval = NCONF_get_section(conf, section))) 337 return 0; 338 for (i = 0; i < sk_CONF_VALUE_num(nval); i++) { 339 val = sk_CONF_VALUE_value(nval, i); 340 if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value))) 341 return 0; 342 if (sk) 343 X509v3_add_ext(sk, ext, -1); 344 X509_EXTENSION_free(ext); 345 } 346 return 1; 347 } 348 349 /* 350 * Convenience functions to add extensions to a certificate, CRL and request 351 */ 352 353 int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 354 X509 *cert) 355 { 356 STACK_OF(X509_EXTENSION) **sk = NULL; 357 if (cert) 358 sk = &cert->cert_info->extensions; 359 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 360 } 361 362 /* Same as above but for a CRL */ 363 364 int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 365 X509_CRL *crl) 366 { 367 STACK_OF(X509_EXTENSION) **sk = NULL; 368 if (crl) 369 sk = &crl->crl->extensions; 370 return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 371 } 372 373 /* Add extensions to certificate request */ 374 375 int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, char *section, 376 X509_REQ *req) 377 { 378 STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL; 379 int i; 380 if (req) 381 sk = &extlist; 382 i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk); 383 if (!i || !sk) 384 return i; 385 i = X509_REQ_add_extensions(req, extlist); 386 sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free); 387 return i; 388 } 389 390 /* Config database functions */ 391 392 char *X509V3_get_string(X509V3_CTX *ctx, char *name, char *section) 393 { 394 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) { 395 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 396 return NULL; 397 } 398 if (ctx->db_meth->get_string) 399 return ctx->db_meth->get_string(ctx->db, name, section); 400 return NULL; 401 } 402 403 STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, char *section) 404 { 405 if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) { 406 OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED); 407 return NULL; 408 } 409 if (ctx->db_meth->get_section) 410 return ctx->db_meth->get_section(ctx->db, section); 411 return NULL; 412 } 413 414 void X509V3_string_free(X509V3_CTX *ctx, char *str) 415 { 416 if (!str) 417 return; 418 if (ctx->db_meth->free_string) 419 ctx->db_meth->free_string(ctx->db, str); 420 } 421 422 void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section) 423 { 424 if (!section) 425 return; 426 if (ctx->db_meth->free_section) 427 ctx->db_meth->free_section(ctx->db, section); 428 } 429 430 static char *nconf_get_string(void *db, char *section, char *value) 431 { 432 /* TODO(fork): this should return a const value. */ 433 return (char *)NCONF_get_string(db, section, value); 434 } 435 436 static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, char *section) 437 { 438 return NCONF_get_section(db, section); 439 } 440 441 static const X509V3_CONF_METHOD nconf_method = { 442 nconf_get_string, 443 nconf_get_section, 444 NULL, 445 NULL 446 }; 447 448 void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf) 449 { 450 ctx->db_meth = &nconf_method; 451 ctx->db = conf; 452 } 453 454 void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req, 455 X509_CRL *crl, int flags) 456 { 457 ctx->issuer_cert = issuer; 458 ctx->subject_cert = subj; 459 ctx->crl = crl; 460 ctx->subject_req = req; 461 ctx->flags = flags; 462 } 463
